/Engine/Plugins/Animation/IKRig/Source/IKRig/Public/Retargeter/IKRetargetProcessor.h
struct FRetargetChainPairFK : public [FRetargetChainPair](API\Plugins\IKRig\Retargeter\FRetargetChainPair)
FChainDecoderFK
FKDecoder
FChainEncoderFK
FKEncoder
FPoleVectorMatc...
PoleVectorMatcher